I do get your point that they’re uncommon requirements but my point was Teams doesn’t any uniquely granted permissions that Google have backdoored for Microsoft. So it is entirely possible that another app / VoIP client (or even malicious actor) could prevent emergency calls.
This is what I am reading also. Couple that with another similar and recent bug discussed in the reddit thread this links to (https://www.androidpolice.com/notifications-feeling-sluggish...) and I'm starting to wonder if there isn't a whole host of unnoticed side effects in peoples Android devices.
These are failures on the Android level, apps users can download from the store shouldn't have the capability to break things like calling emergency services, or notifications for other apps.